HIGH EFFICIENCY ENVELOPE TRACKING AMPLIFIER, METHOD THEREOF AND MULTI-LEVEL DC-DC CONVERTER FOR HIGH EFFICIENCY ENVELOPE TRACKING AMPLIFIER

摘要

PURPOSE: A high efficiency envelope tracking amplifier, a method thereof, and a multi-level DC-DC converter for high efficiency envelope tracking amplifier are provided to reduce a ripple current generated from the DC-DC converter by using the DC-DC converter in multiple bits. CONSTITUTION: A baseband signal applying unit applies a baseband signal to a power amplifying unit. A signal converting unit detects an envelope signal from the baseband signal. The signal converting unit outputs a voltage according to a multilevel quantization signal by quantizing the detected envelope signal into a multiple level. A signal amplifying unit receives power from the signal amplifying unit. The signal amplifying unit amplifies the baseband signal inputted from the baseband signal applying unit. The signal converting unit quantizes the envelope signal to a K-bit(K>=2).